Compact MIMO antenna for application to smart glasses using T‐shaped ground plane

Abstract

A compact multiple‐input multiple‐output (MIMO) antenna design for application to smart glasses is proposed in this letter. The proposed MIMO antenna system is comprised of two symmetrical meander antennas operating in the 2.4‐GHz wireless local area network band and a T‐shaped ground for high isolation. The operation mechanism of the proposed MIMO antennas can be explained using the analysis of a three‐port network. Accordingly, the T‐shaped ground plane operates as a decoupling structure such that the isolation between antennas can be controlled by tuning the T‐shaped ground plane. The reflection coefficient characteristic was measured to be less than −7.5 dB, whereas the isolation obtained was higher than 15 dB. The diversity performance was evaluated using the measured three‐dimensional radiation patterns, and the envelope correlation coefficients in the target band were less than 0.1.

Ultra‐compact 4‐port DR antenna for multi‐input multi‐output standards

“…In fact, the main difficulty in designing compact MIMO antennas is to achieve high levels of isolation between adjacent antennas while maintaining excellent radiation efficiency. In this area, several useful solutions to get proper isolation levels and compact MIMO structures are reported . In, the miniaturization technique is introduced to achieve good isolation, for two‐coupling element antennas designed for MIMO‐4G systems.…”

“…A 2 × 2 and 2 × 4 MIMO antennas are introduced in Reference , which consist of patch antennas loaded with complementary split‐ring resonators for antenna miniaturization. The technique of decoupling is also reported in to obtain a compact 2‐port MIMO antenna operating in the 2.4‐GHz standard for smart glasses. In Reference , a defected ground structure (DGS) is implemented between two microstrip patch antenna elements in order to limit the surface wave mode propagation.…”

“…In this area, several useful solutions to get proper isolation levels and compact MIMO structures are reported. [3][4][5][6][7][8][9][10][11][12] In, 3 the miniaturization technique is introduced to achieve good isolation, for two-coupling element antennas designed for MIMO-4G systems. Another technique based on the reduction of mutual coupling between antenna elements by using metamaterials is presented in.…”